Cancellation of ADSL

I have been trying to cancel my ADSL line since end of April 2018 and Telkom is still debiting me and sending Invoices for the following month. When I visited the Telkom branch at Greenacres in Port Elizabeth i wanted to move my line as i was relocating to a new house. They helped to process my request but apparently my new area did not have ADSL coverage so the consultant suggested that i should rather cancel my contract as there were no other options for me to gain access to my service. I filled in the form and sent it to ********** on the 3rd April 2018.. they said i had to wait 30days in order for my request to be processed and that i would be charged for April2018 but would receive a final invoice in May that would be debited end of May 2018. On the 6th May 2018 i received invoice but it was not the final invoice. I called 10210 and the consulted asked me to forwad him the email i sent to servcancellation. I never got any repsonse from the consulted . I than spoke to 4 more over a period of 3weeks all of them promising to escalate and will get back to me with the feedback. I cannot continue to pay for a service that im no longer using .. it is unfaur of telkom to do this to me.. i need my May premiums back and for you to provide me with the final invoice.